package com.yunhai.xc.conf.shiro;

import java.util.LinkedHashMap;
import java.util.Map;

import org.apache.shiro.authc.credential.HashedCredentialsMatcher;
import org.apache.shiro.spring.LifecycleBeanPostProcessor;
import org.apache.shiro.spring.security.interceptor.AuthorizationAttributeSourceAdvisor;
import org.apache.shiro.spring.web.ShiroFilterFactoryBean;
import org.apache.shiro.web.mgt.DefaultWebSecurityManager;
import org.springframework.aop.framework.autoproxy.DefaultAdvisorAutoProxyCreator;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.DependsOn;

import com.yunhai.xc.conf.redis.SpringCacheManagerWrapper;

import at.pollux.thymeleaf.shiro.dialect.ShiroDialect;

@Configuration
public class ShiroConfiguration {
	@Bean
	public SpringCacheManagerWrapper springCacheManager() {
		return new SpringCacheManagerWrapper();
	}

	/**
	 * LifecycleBeanPostProcessor，这是个DestructionAwareBeanPostProcessor的子类，
	 * 负责org.apache.shiro.util.Initializable类型bean的生命周期的，初始化和销毁。
	 * 主要是AuthorizingRealm类的子类，以及EhCacheManager类。
	 */
	@Bean(name = "lifecycleBeanPostProcessor")
	public LifecycleBeanPostProcessor lifecycleBeanPostProcessor() {
		return new LifecycleBeanPostProcessor();
	}

	/**
	 * HashedCredentialsMatcher，这个类是为了对密码进行编码的， 防止密码在数据库里明码保存，当然在登陆认证的时候，
	 * 这个类也负责对form里输入的密码进行编码。
	 */
	@Bean(name = "hashedCredentialsMatcher")
	public HashedCredentialsMatcher hashedCredentialsMatcher() {
		HashedCredentialsMatcher credentialsMatcher = new HashedCredentialsMatcher();
		credentialsMatcher.setHashAlgorithmName("MD5");
		credentialsMatcher.setHashIterations(2);
		credentialsMatcher.setStoredCredentialsHexEncoded(true);
		return credentialsMatcher;
	}

	/**
	 * ShiroRealm，这是个自定义的认证类，继承自AuthorizingRealm，
	 * 负责用户的认证和权限的处理，可以参考JdbcRealm的实现。
	 */
	@Bean(name = "shiroRealm")
	@DependsOn("lifecycleBeanPostProcessor")
	public ShiroRealm shiroRealm() {
		ShiroRealm realm = new ShiroRealm();
		// realm.setCredentialsMatcher(hashedCredentialsMatcher());
		return realm;
	}

	// /**
	// * EhCacheManager，缓存管理，用户登陆成功后，把用户信息和权限信息缓存起来，
	// * 然后每次用户请求时，放入用户的session中，如果不设置这个bean，每个请求都会查询一次数据库。
	// */
	// @Bean
	// public EhCacheManager ehCacheManager() {
	// EhCacheManager em = new EhCacheManager();
	// em.setCacheManagerConfigFile("classpath:ehcache-shiro.xml");
	// return em;
	// }

	/**
	 * SecurityManager，权限管理，这个类组合了登陆，登出，权限，session的处理，是个比较重要的类。 //
	 */
	@Bean(name = "securityManager")
	public DefaultWebSecurityManager securityManager() {
		DefaultWebSecurityManager securityManager = new DefaultWebSecurityManager();
		securityManager.setRealm(shiroRealm());
		// securityManager.setCacheManager(ehCacheManager());
		securityManager.setCacheManager(springCacheManager());
		return securityManager;
	}

	/**
	 * ShiroFilterFactoryBean，是个factorybean，为了生成ShiroFilter。
	 * 它主要保持了三项数据，securityManager，filters，filterChainDefinitionManager。
	 */
	@Bean(name = "shiroFilter")
	public ShiroFilterFactoryBean shiroFilterFactoryBean() {
		ShiroFilterFactoryBean shiroFilterFactoryBean = new ShiroFilterFactoryBean();
		shiroFilterFactoryBean.setSecurityManager(securityManager());
		Map<String, String> filterChainDefinitionManager = new LinkedHashMap<String, String>();
		filterChainDefinitionManager.put("/logout", "logout");
		// filterChainDefinitionManager.put("/shiro/p3", "authc,roles[admin]");
		// filterChainDefinitionManager.put("/shiro/**", "authc");
		// filterChainDefinitionManager.put("/**", "anon");
		// 如果不设置默认会自动寻找Web工程根目录下的"/login.jsp"页面
		shiroFilterFactoryBean.setLoginUrl("/");
		shiroFilterFactoryBean.setUnauthorizedUrl("/shiro/403");
		shiroFilterFactoryBean.setFilterChainDefinitionMap(filterChainDefinitionManager);
		return shiroFilterFactoryBean;
	}

	/**
	 * DefaultAdvisorAutoProxyCreator，Spring的一个bean，由Advisor决定对哪些类的方法进行AOP代理。
	 */
	@Bean
	@ConditionalOnMissingBean
	public DefaultAdvisorAutoProxyCreator defaultAdvisorAutoProxyCreator() {
		DefaultAdvisorAutoProxyCreator defaultAAP = new DefaultAdvisorAutoProxyCreator();
		defaultAAP.setProxyTargetClass(true);
		return defaultAAP;
	}

	/**
	 * AuthorizationAttributeSourceAdvisor，shiro里实现的Advisor类，
	 * 内部使用AopAllianceAnnotationsAuthorizingMethodInterceptor来拦截用以下注解的方法。
	 */
	@Bean
	public AuthorizationAttributeSourceAdvisor authorizationAttributeSourceAdvisor() {
		AuthorizationAttributeSourceAdvisor aASA = new AuthorizationAttributeSourceAdvisor();
		aASA.setSecurityManager(securityManager());
		return aASA;
	}

	/******* thymeleaf支持 ******/
	@Bean
	public ShiroDialect shiroDialect() {
		return new ShiroDialect();
	}

}